The Liénard-Wiechert potentials for a relativistic electron are given in cgs by
where
is the scalar potential,
is the charge on the electron, R is vector from the retarded position of the electron (i.e., the position at which is was "seen" from position r at time t),
is relativistic beta vector, and A is the magnetic vector potential. In MKS,
where
and 
are the permittivity of free space and permeability of free space, respectively.
(1)
(2)
where
is the scalar potential, is the charge on the electron, R is vector from the retarded position of the electron (i.e., the position at which is was "seen" from position r at time t), is relativistic beta vector, and A is the magnetic vector potential. In MKS,(3)
(4)
where
and are the permittivity of free space and permeability of free space, respectively. 
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